VEED Subtitle - A simple & fast way to add subtitles to your videos online
Zubtitle - Zubtitle is an online tool that makes it easy to add captions to any video.
Subly Pro - Subtitle videos and audio automatically in seconds
Video Subtitle Maker - Add captions directly to your videos online
Kapwing - Collaborative video editor for modern creative teams
Media.io - Media.io has all the handy tools you need for video & audio converting (.mp4, .mp3, .mov, .mkv, .avi, .wav, etc.) and editing, like generating auto subtitles, applying engaging text, music, effects, templates.